There is a graph in the LM3886 datasheet showing approximately 18W power output at slightly over 2 ohms. You can parallel two of them to double that, but they really aren't suited for 1 ohm load, why not use different speakers instead and use your LM3886's to build a few amps that drive typical speakers?

What specifically are you driving, multiple drivers in parallel? If so, it would make more sense to wire them in series, or if it's whole speaker speaker systems with passive crossovers, just use one chip amp per system. A one ohm load is going to be tough on just about any amp.

Oh yeah, for the second part of your question, when you bridge amps, you must de-rate output capability by a factor of two, so an eight ohm load effectivly becomes a four ohm load. So to drive a one ohm load in bridge mode you would need to parallel four amps on both sides of the bridge for a total of eight per channel.

Whoops, my stupid old brain didn't do the math right, to drive a one ohm load in a bridge, which is the same as 1/2 ohm single ended, you would need eight amps per side for a total of sixteen per channel. I don't think you want to go there.